How to grow spring potatoes

There are three ways of early ripening cultivation of potato in spring: double film mulching in plastic film small arch shed, thick film small arch greenhouse mulching and plastic film laying. The potato cultivated by these methods can be put on the market 10 to 20 days earlier than that cultivated in the open field.

No matter what kind of mulching method is adopted in the selection of improved varieties, the original varieties of Dongnong 303 or Kexin No. 4 transferred from the northeast must be selected, not self-retained species, let alone native species with self-breeding for many years, aging varieties and serious degradation of species. The amount of seed per mu is about 150 kg, and the big potato can be cut and sown. Each seed potato weighs 20-25 grams and has 2-3 budding eyes.

Due to the inconvenience of topdressing after plastic film mulching, fertilizer should be applied at one time before plastic film mulching. When ploughing, 50 kg of ternary compound fertilizer (15% each of nitrogen, phosphorus and potassium) was applied to each mu. After land preparation, more than 30 piculs of rotten farm organic fertilizer or human feces and urine should be applied, and the hole should be deeper and larger. First, use human manure to point the hole, then apply a handful of livestock and poultry manure, and then cover it with a layer of soil to avoid direct contact between seed potatoes and fertilizer, affecting seedling emergence. The rest of the fertilizer can be applied in trenches between the rows, and then covered with soil, and there is no need to topdressing later.